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Added generic buffer and queue implementation for audio buffering

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Sion Chaudhuri 2013-04-30 00:20:52 -07:00 committed by Michael Jumper
parent 89679e710a
commit 5bc4a01a5e
4 changed files with 263 additions and 0 deletions
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64
protocols/vnc/include/buffer.h Normal file
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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is buffer.
*
* The Initial Developers of the Original Code are
* Craig Hokanson <craig.hokanson@sv.cmu.edu>
* Sion Chaudhuri <sion.chaudhuri@sv.cmu.edu>
* Gio Perez <gio.perez@sv.cmu.edu>
*
* Portions created by the Initial Developer are Copyright (C) 2013
* the Initial Developers. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef __GUAC_VNC_BUFFER_H
#define __GUAC_VNC_BUFFER_H
#include <pthread.h>
#include <guacamole/client.h>
#include "queue.h"
typedef struct {
queue data_queue;
pthread_mutex_t update_lock;
pthread_cond_t cond;
} buffer;
void buffer_init(buffer* buf, int size_of_data);
void buffer_free(buffer* buf);
void buffer_close(buffer* buf);
void buffer_insert(buffer* buf, void* data, int size_of_data);
void buffer_remove(buffer* buf, void* data, int size_of_data, guac_client* client);
#endif

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protocols/vnc/include/queue.h Normal file
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/* ***** BEGIN LICENSE BLOCK *****
* queue.c
*
* Implementation of a FIFO queue abstract data type.
*
* by: Steven Skiena
* begun: March 27, 2002
*
* Copyright 2003 by Steven S. Skiena; all rights reserved.
*
* Permission is granted for use in non-commerical applications
* provided this copyright notice remains intact and unchanged.
*
* Modified for the Guacamole project by:
* Craig Hokanson <craig.hokanson@sv.cmu.edu>
* Sion Chaudhuri <sion.chaudhuri@sv.cmu.edu>
* Gio Perez <gio.perez@sv.cmu.edu>
*
* ***** END LICENSE BLOCK ***** */
#ifndef __GUAC_VNC_QUEUE_H
#define __GUAC_VNC_QUEUE_H
#define QUEUESIZE 200
typedef struct {
void* items[QUEUESIZE+1]; /* body of queue */
int first; /* position of first element */
int last; /* position of last element */
int count; /* number of queue elements */
} queue;
void queue_init(queue* q, int size_of_element);
void queue_free(queue* q);
int enqueue(queue* q, void* data, int size);
int dequeue(queue* q, void* data, int size);
#endif

86
protocols/vnc/src/buffer.c Normal file
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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is buffer.
*
* The Initial Developers of the Original Code are
* Craig Hokanson <craig.hokanson@sv.cmu.edu>
* Sion Chaudhuri <sion.chaudhuri@sv.cmu.edu>
* Gio Perez <gio.perez@sv.cmu.edu>
*
* Portions created by the Initial Developer are Copyright (C) 2013
* the Initial Developers. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <stdlib.h>
#include <string.h>
#include "buffer.h"
#include "queue.h"
void buffer_init(buffer* buf, int size_of_data) {
queue_init(&(buf->data_queue), size_of_data);
}
void buffer_free(buffer* buf) {
queue_free(&(buf->data_queue));
}
void buffer_close(buffer* buf) {
pthread_cond_signal(&(buf->cond));
}
void buffer_insert(buffer* buf, void* data, int size_of_data) {
pthread_mutex_lock(&(buf->update_lock));
enqueue(&(buf->data_queue), data, size_of_data);
pthread_mutex_unlock(&(buf->update_lock));
pthread_cond_signal(&(buf->cond));
}
void buffer_remove(buffer* buf, void* data, int size_of_data, guac_client* client) {
pthread_mutex_lock(&(buf->update_lock));
if((buf->data_queue).count <= 0)
pthread_cond_wait(&(buf->cond), &(buf->update_lock));
/* If the thread was signaled during a close,
the queue might still be empty */
if((buf->data_queue).count > 0)
dequeue(&(buf->data_queue), data, size_of_data);
pthread_mutex_unlock(&(buf->update_lock));
}

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protocols/vnc/src/queue.c Normal file
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/* ***** BEGIN LICENSE BLOCK *****
* queue.c
*
* Implementation of a FIFO queue abstract data type.
*
* by: Steven Skiena
* begun: March 27, 2002
*
* Copyright 2003 by Steven S. Skiena; all rights reserved.
*
* Permission is granted for use in non-commerical applications
* provided this copyright notice remains intact and unchanged.
*
* Modified for the Guacamole project by:
* Craig Hokanson <craig.hokanson@sv.cmu.edu>
* Sion Chaudhuri <sion.chaudhuri@sv.cmu.edu>
* Gio Perez <gio.perez@sv.cmu.edu>
*
* ***** END LICENSE BLOCK ***** */
#include <stdlib.h>
#include <string.h>
#include "queue.h"
void queue_init(queue* q, int size_of_element) {
int i;
q->first = 0;
q->last = QUEUESIZE-1;
q->count = 0;
for(i = 0; i < QUEUESIZE; i++)
q->items[i] = malloc(size_of_element);
}
void queue_free(queue* q) {
int i;
for(i = 0; i < QUEUESIZE; i++)
free(q->items[i]);
}
int enqueue(queue* q, void* data, int size) {
if (q->count >= QUEUESIZE)
return -1;
q->last = (q->last+1) % QUEUESIZE;
memcpy(q->items[ q->last ], data, size);
q->count = q->count + 1;
return 0;
}
int dequeue(queue* q, void* data, int size) {
if (q->count <= 0)
return -1;
memcpy(data, q->items[ q->first ], size);
q->first = (q->first+1) % QUEUESIZE;
q->count = q->count - 1;
return 0;
}